In python,
with re.sub, how I can replace a substring with a new string ?
from
number = "20"
s = "hello number 10, Agosto 19"
to
s = "hello number 20, Agosto 19"
I try
re.sub(r'number ([0-9]*)', number, s)
the number 10 is a example, the number in the string can be any number.
You mean this?
>>> import re
>>> m = re.sub(r'10', r'20', "hello number 10, Agosto 19")
>>> m
'hello number 20, Agosto 19'
OR
Using lookbehind,
>>> number = "20"
>>> number
'20'
>>> m = re.sub(r'(?<=number )\d+', number, "hello number 10, Agosto 19")
>>> m
'hello number 20, Agosto 19'
Do not use regex for such simple cases. Normal string manipulation is enough (and fast):
s = "hello number 10, Agosto 19"
s = s.replace('10', '20')
'1010' shouldn't be converted to '2020' and the OP is omitting the fact they're really after how to replace words (eg, use of regex word boundaries)
s = "hello number 10, Agosto 19 if you like 10", I want to just substitute the second 10?
If you don't know the number but know it is followed by a ,
import re
re.sub("\d+(?=,)","20",s) # one or more digits followed by a ,
hello number 20, Agosto 19
import re
re.sub("(\d+)","20",s,1) # first occurrence
hello number 20, Agosto 19
\d+(?=,)
re.sub."hello number 10, Agosto 19".replace("10","20")